We would finish 7-1. Both OU and OSU finish 7-2. The conference would then announce Bedlam 2.0 for the championship because ISU didn't play a full conference schedule. Somehow this would happen.
Actually, we'd still be #1. The league tie-breaker rules state that the minimum number of required games is 1 less than the average number of conference games played. So it is impossible for the minimum requirement to be 9 games. If the records are unbalanced, you compare losses, and we win that.